DE2321648A1 - Round plastic foam made from strip - by longitudinally notching then rolling over and welding - Google Patents

Abstract

Long plastic cord, e.g. of a round section, is made from plastic sheet or board, esp. foam plastic, as follows: the matl. initially in the form of sheet or board, is cut into strips and these are then grooved or notched longitudinally to produce intended folding lines; the strips are then folded round hinging on these lines, opt. welded or glued at the lines and thus formed into a round section structure, finally, a longitudinal seam is produced to close the structure and it is then passed through a die, opt. with heat treatment, to produce the desired size.

Description

Method and device for the continuous production of elastic Profiles The invention relates to a method and an apparatus for manufacturing of profile cords made of sheets or plates, possibly containing an insert made of elastic material.

It is known to directly extrude or foam profile cords.

Furthermore, e.g. a wire core with an elastic material can be passed through Sheath extrusion or similar.

Both procedures are only suitable for mass production and are limited to profiles with simple cross-sections. When changing form and cross section of the ProS'bzsir.

of the Ke @@ s that may have to be introduced are always new tools necessary.

When working, round cords by winding and welding or. It was shown that this can be done with simple Funding is not possible. A Path to continuous production however, it was found in the previous folding and welding process. After that you can Cords with a relatively precise circular cross-section or numerous other selectable ones Cross-sectional shapes can be manufactured economically.

The invention relates to a continuous process for production of profile cords made of battens or plates, possibly containing an insert made of elastic material, in particular plastic, for example foam plastic, which is characterized by the fact that from the 3 teeth resp.

Plate strips are cut, the strip in the longitudinal direction is scored at predetermined folds, the strip is then folded and if necessary, the longitudinal folds are at least partially welded or glued, wherein the folding process and optionally the welding bov. Gluing the longitudinal fold is repeated at other notches, then the welding or gluing of the folded Strip to the closed profile along a sealing seam takes place and finally the cord cross-section is calibrated with heating if necessary.

The sheets or panels are made primarily of elastic plastics foamed plastic, such as crosslinked or uncrosslinked polyethylene or PVC.

-The strips can optionally be glued in the transverse direction glued to form endless strips.

The folds can be welded with hot air, IR or high frequency heating will.

Reinforcements made of metal or plastic can be put on before folding the strips are laid.

The strip is generally notched or folded on the sides, on the underside and possibly also on the top.

The strip can be used for a fixation after welding or gluing experience when running through a contact stretch.

Another subject matter is a device for carrying out the method characterized by one with scoring rollers, scoring knives, milling cutters, cutting knives, Wedges, embossing rollers or the same equipped notching device and at least a subsequent folding device equipped with guide plates for folding, which is connected to a welding or gluing device, and a calibration device, and finally a take-off and take-up device for the Profilachnur.

Optionally, the folds can be welded or glued or without Weld or bond remain. The closure has to be welded in any case or to glue.

To fold the strip can be arranged laterally in the direction of travel baffles narrowing in a funnel shape may be provided.

A feed can be provided between the notching device and the folding device be arranged for inserting reinforcements in the profile cord.

As a rule, for guiding the strips, rolls or with guided Clamping jaws provided.

Pressing devices can be used to fix the welded or glued longitudinal folds E.g. one or more circulating conveyor belts above and below the strip Roll pairs, which are preferably profiled, may be provided.

The last or additionally preceding pressing devices can be used as an optionally heatable calibration device for shaping the final Be formed cross-section of the profile cords.

Examples of possible profile shapes are shown in the drawing; she make no claim to completeness, Fig. 1 shows the schematic structure of a round profile with a roughly circular cross-section, created by several folds (1) and welds (2) and a sealing seam (3).

Fig. 2 shows the cross section of a folded sealing cord with free thigh.

Fig. 3 shows the cross section of a strip of fodder.

Fig. 4 shows the cross section of a V-shaped sealing profile.

Fig. 5 shows the cross section of a lining strip with an insert (4) in the form of a plastic band to reinforce against tensile forces.

Fig. 6 shows a round profile in cross section with a sheet metal strip insert (5). This enables stiffening against bending and shaping.

Fig. 7 shows the longitudinal section of a curved round profile according to Fig. 6th

Fig. 8 shows the cross section of a profile with Dreiksntstab (6) as Carrier According to the present manufacturing process, a wide variety of other profile cords can be created with It is also advantageous to produce those with complicated cross-sectional shapes.

The following are the working steps of the process, the manufacturing process and the used device parts schematically for a round cord with reinforcing bend described.

Step 1: Notches through sets of rollers at predetermined folds Figure 9 shows the strip (7), its lateral guides (8) and an axis (9) with the adjustable Xerbrollen (10) as well as the achieved notches (11). The counter roller (12) is also a transport aid. The speed is that adapted to the general working speed of the system.

Step 2: Folding in the strip edges and then Tack welding Figure 10 shows a sliding surface (13) and lateral guide plates (14), Between those of the strips (7) folded at the two outer notches (11) and at the same time basically (15) through the welding nozzle (16), which is designed here as a hot air double nozzle is being welded. Except for the baffles (14) are in front of this in the working direction Place even more specially shaped baffles that facilitate the folding process from the flat strip to the state shown.

Work step 3: holding together and cooling the first weld Between the baths (17) of a transport device rotating in the working direction according to Fig. 11, the folded strip (18) with its two tack welds (19) fixed until it has cooled down sufficiently.

Step 4: Second folding process in the area of the middle of the strip with inserted reinforcement tape and welding. The pre-folded strip according to Step 3 is followed by a conical one, not shown in FIG Funnel with guide plates pulled into a round nozzle (20).

At the same time, the reinforcement tape (4) is fed in.

In the working direction behind the round nozzle (20) is a welding device (21) with a hot air nozzle (16) arranged in the outer gusset (22) of the fold (1) the Welding of the sealing seam (3) causes.

Work step 5: holding together and cooling the second weld Between the belts (17) circulating in the working direction according to FIG. 13 of a transpo rtvo rrichtung, the weld (2) becomes the sealing seam of the folded profile (23) fixed until it has cooled down sufficiently.

Step 6: Reshaping the profile It is useful and advantageous to to follow step 5 with a post-forming process. This shown in FIG Reshaping or calibration can optionally be profiled in the working direction circumferential belts (17) of a transport device take place. It is also possible, to venaende several successively arranged and driven pairs of rollers. Ever Depending on the material or other requirements, a heating device not shown here this step 6 must be set in advance.

FIG. 15 shows the overall diagram of a production device for round profiles presented according to this procedure.

The interchangeable magazine (24) is used for sheet or plate strips (7) to accommodate the strips to be processed. In order to be continuous manufacturing at least two magazine rollers (25) are provided.

The glue table (26) is used to connect the ends of the strips.

The DurchharE (27) with the height-adjustable deflection (28) enables the connection of the strip ends (29) on the table (26) in the short-term standstill of the strip ends.

The notch device (30) marks and notches with its drive (51) the folds running in the plane of the drawing in the working direction and facilitated the folding process (see step 1).

The strip (7) also runs through a folding section (32) Guide plates (14) for carrying out the first folding process.

At the end of the folding section (32) is a hot air nozzle (16) with a trained Welding device (21) arranged (see. Step 2).

The transport device (33) with the driven, in the working direction revolving belts (17), the above-described step 3 thereby leads.

The emerging strip, folded and welded on both edges (23) opens into a folding funnel (34) in which corresponding guide plates (14) are arranged are. The round nozzle (20) is arranged at the end of the funnel (34). In detail is this step 4 is described in more detail above. Located at the end of the round nozzle (20) a welding device (21). The air emerging from the hot air nozzle (16) causes the welding of the seam.

The driven belts (17) rotating in the working direction at the same time pressing device acting as a transport device fix the weld until it cools down, as shown in step 5.

The transport device (35) effects the process described in step 6 Post-forming process through calibration.

Cords manufactured in this way are wound onto reels in the usual way or cut to finite lengths.

Claims (15)

Claims 1. Process for the continuous production of optionally one Profile cords containing inlay made of sheets or plates made of elastic material, in particular plastic, for example foam plastic, characterized in that that strips are cut from the sheets or plates, the strips in the longitudinal direction is scored at predetermined folds, the strip is then folded and if necessary, the longitudinal folds are at least partially welded or glued, wherein the folding process and optionally the welding or gluing of the longitudinal fold is repeated at other notches, then the welding or gluing of the folded Strip to the closed profile takes place along a locking seam and finally the cord cross-section is calibrated with heating if necessary. 2. The method according to claim 1, characterized in that the strips if necessary, glued in the transverse direction to form endless strips. 3. The method according to claim 1 or 2, characterized in that the Folds can be welded with hot air, IR or high frequency heating. 4. The method according to any one of claims 1 to 3, characterized in that that reinforcements made of metal or plastic are placed on the strip before folding will. 5. The method according to any one of claims 1 to 4, characterized in that that the strip when notching or folding on the sides, on the underside and possibly is also performed on the top. 6. The method according to any one of claims 1 to 5, characterized in that that the strip after welding or gluing a fixation when passing through a press-on section experiences. 7. Device for performing the method according to one of the preceding Claims, characterized by one with scoring rollers, scoring knives, milling cutters, cutting knives, vlen, embossing rollers, or the like equipped notching device and at least a subsequently arranged with guide plates equipped for the folding -'t device, which may be followed by a welded or small joint, and a calibration device, and finally a take-off and take-up device for the profile cord. 8. Apparatus according to claim 7, characterized in that for folding of the strip arranged laterally in the running direction funnel-shaped narrowing baffles are provided. 9. Device according to one of claims 7 to 8, characterized by a feeding device arranged niches of the notching device and the folding device for inserting reinforcements in the profile cord. 10. Device according to one of claims 7 to 9, characterized in that that rollers or entrained clamping jaws are provided for guiding the strip. 11. Device according to one of claims 7 to 10, characterized in that that to fix the welded resp. glued longitudinal folds a pressing device is provided. 12. The device according to claim 11, characterized in that upper and circulating conveyor belts are provided on the underside of the strip. 13. The apparatus according to claim 11, characterized in that preferably profiled roller pairs are provided. 14. Device according to one of claims 7 to 13, characterized in that that the pressing device, if necessary as a calibration device is trained. 15. Device according to one of claims 7 to 14, characterized in that that the calibration device is designed to be temperature-controlled.